Locomotive boiler



July 28, 1931. A. w. B RUCE LOCOMOTIVE. BOILER Filed Feb. 3, 1928 2 Sheets-Sheet 2 INVENTOR fl/ rd NB/wce.

I llulli'lI-Lll IIIIIILI Patented July 28, 1931 UNITED; STATES PATENT OFFICE ALFRED W. BRUCE, or NEW YORK, N. Y.

LOCOMOTIVE BOILER Application filed February 3, 1928; Serial N0. 251,508.

s'ive construction and ready applicability in locomotive boilers of present standard constructions, in the operation of which the crown sheet will be firmly supported, increase of Water heating surface be made, and circu- 'lation of water'in the firebox be promoted.

' The improvement claimed is hereinafter *fully" set forth.

' In the accompanying drawings: Figure 1' is a fragmental verticallongitudinal section, on the line II of Fig. 2, through the rear portion of a locomotive boiler, illustrating an embodiment of the'invention; Fig. 2 a

25. fragmental half plan view, partly broken away,-of the same Fig. 3 a vertical transverse section, the left handhalf being taken on the line' III III of-Fig. Land the right hand half on the line, IIIIII of the same fig- I ure; Figs. 4 to 9 inclusive are enlarged frag- I mental views; Fig. 4 a section taken on the line IV-IV of Fig. 5 Fig. 5 a half front view of parts shown in Fig. 4 and a half sectional view'taken on the line VV of Fig. 4; Fig. I 6 a plan view of parts shown in Fig. 4; Fig.

7 a modified form of the parts shown in Fig.

4 taken on the line VIIVII of Fig. 8; Fig.-

8 a front view of the parts shown in Fig. 7; and Fig. 9 a plan view of parts shown in Fig.7.

In the practice of the invention, referring descriptively to the specific embodiment thereof which is herein exemplified as applied in a locomotive boiler of the standard com- I bustion chamber class, having a firebox, in-

dicated, as an entirety, by A; a waist or bar-' rel, indicated by B, and a combustion chamber, indicated by 0, two or more crown sheet supporting and water circulating members,- I59 1,1, are located in the forward portion of the combustion chamber. tical water walls, of substantially triangular outline, the upper and wider ends of which firebox, A, and the adjoining portion of the Said members arever- I are open to the space Withinthe boiler above 52 the crown sheet, 2. The upper ends of the ,plates which form the water walls, are secured, by rivets, to upwardly turned flanges 2a, onthe crown sheet and adjoining sheet of the combustion chamber, one or more rows of ct the radial staybolts, 2?), by which said sheets are connectedto the shell sheets of the boiler, being omitted, to afford space for the insertion of the water walls, as clearly indicated in Fig. 2. c: i

A pipe 4 leads from the waist of the boiler toa header 4a which communicates with the lower ends of each of the members 1. A pair of header supports 5 are secured at their front ends to the mud ring front portion 6 and at T5 their rear ends to a transverse bar 7 secured at itsen'ds each to a side of the mud ring. The header 4a is provided with the bottom .plate 46 which maybe removed'for the purpose of cleaning the header. Arch tubes 8 are provided, the rear ends of which are secured in the upper rear portion of the fire box A and the front ends of which are secured in the rear portion of the header 4a. A second set of arch tubes 9 are likewise supported at so their rear ends in the upper part of the rear end of thefire box A, the front portions of which pass between the water legs with their ends connected in the rear of the throat 10 of a portion 13of the waist B which extends 8 ,about the combustion chamber C. An arch 11 of fire brick is supported upon the arch tubes which extends through the front poriion of the fire box A'and the rear portion of I the combustion chamber C.

In the construction of-Figs. 7 to 9 inclusive,

is shown a modified structure wherein, instead of the supports 5, lateral supporting plates-12 areemployed, which,,in thepresent instance, are formed integral with the header 12a and have their outer ends 12?) secured to the sides of the mud ring 120.

The invention claimed and desired to be secured by Letters Patent, is:

1. Infa steam boiler of the locomotive type,

the combination of a crown sheet; a plurality of spaced substantially vertical water walls, having open upper ends secured to upwardly pro ecting flanges on said crown sheet; a transversely extending header, rigtheir lower ends secured in said header; a

pipe leading from the waist of the boiler to the header; and a cradle member rigidly secured to the header and tot-he bottom of the firebox.

3. In a stem boiler ot' the locomotive type, the combination of a crown sheet; a waist; an inner throat sheet; a plurality of spaced substantially vertical water walls having open upper ends secured to said crown sheet; a header disposed rearwardly of the inner throat sheet, rigidly connected to, and com municating with, the lower ends of the water walls; and a passageway leading from the waist to the header.

4. In a steam boiler of the locomotive type, the combination of a crown sheet; a mud ring; a waist; an inner throat sheet; a plurality of spaced substantially vertical water walls, having open upper ends secured to said crown sheet; a header disposed rearwardly of the inner throat sheet, rigidly connected to, and communicating with, the lower ends of the water walls; and a passageway leading from the waist, below the mud ring to the header.

5. In a steam boiler of the locomotive type, the combination of a crown sheet; a Waist;

an inner throat sheet; a plurality of spaced substantially vertical water walls, having open upper ends secured to said crown sheet; a header disposed rearwardly of the inner throat sheet, rigidly connected to, and communicating with, the lower ends of the water walls; a passageway leading from the waist to the header; and arch tubes communicating with the header.

6. In a steam boiler of the locomotive type, the combination of a crown sheet; a mud ring; a waist; an inner throat sheet; a plurality of spaced substantially vertical water walls, having open upper ends secured to said crown sheet; a header disposed rearwardly of the inner throat sheet, rigidly connected to, and communicating with, the lower ends of the water walls; a passageway leading from the waist, below the mud ring, to the header;

and arch tubes communicating with the header.

7 In a steam boiler of the locomotive type, the combination of a fire box; a combustion chamber; a crown sheet; a rear flue sheet at the front end of the combustion chamber; a waist extending each side of the sheet the part to the rear of the sheet enclosing the combustion chamber; a throat at the rear end of the waist; a plurality of spaced substantially vertical water walls disposed partly in the fire box and partly in the combustion chamber and having their upper ends opening into the boiler above the crown sheet; a header disposed rearwardly of said throat and below said waist, and rigidly connected to, and communicating with, the lower ends of the water walls, the bottom portion of said water walls being in communication with the bottom part of the waist; a pipe connecting the header with'the waist; and arch tubes directly connected at one end to the throat.

8. In a steam boilerof the locomotive type, the combination of a fire box; a combustion chamber; a crown sheet; a rear flue sheet at the front end of the combustion chamber; a waist extending each side of the sheet the part to the rear of the sheet enclosing the combustion chamber; a throat at the rear end of the waist; a plurality of spaced substantially vertical water walls disposed partly in the fire box and partly in the combustion chamber and having their upper ends opening into the boilerabove the crown sheet ;aheader disposed rearwardly of said throat and below "said waist, and rigidly connected to, and communlcating with, the lower ends of the water 7 walls, the'bottom portion of said header being in communication with the bottom part of the waist; arch tubes directly connected at one end to the throat; and other arch tubes directly connected with the header.

a ALFRED W. BRUCE. 

